SubSurvival: SSN-13 "Grendel"

You are the captain. The reactor, the crew, the sensors, the weapons - every system on the boat is yours to command, and every mistake is yours to survive.
ABOUT THIS GAME
SubSurvival is a deep, real-time nuclear submarine simulator with a phosphor-green command interface. There are no cutscenes and no quick-time events - just you, a 100-metre steel tube, twelve crewmen doing their jobs, and a cold, hostile ocean full of things trying to kill you.
The whole boat is simulated. Trim the reactor rods against coolant temperature or SCRAM it and wait out the cooldown on battery. Manage the electrical bus - every pump, radar, and sonar draws kilowatts, and a dead battery means a black, deaf boat. Watch O2 and CO2. Fight fires and flooding compartment by compartment. Seal a section to save the ship - and whoever's inside it.

HUNT OR BE HUNTED

Realistic detection warfare: build sonar tracks from faint bearings to fire-control solutions, exploit the thermocline, go deep, go quiet

Full weapons suite: homing torpedoes, cruise missiles, nuclear missiles, noisemaker decoys, and SEA TALON anti-air missiles

Enemies that hunt back: frigates with helicopters and sonobuoy fields, attack subs that evade below your torpedoes' depth envelope, patrol aircraft, minefields

Your noise is their map: cavitation, worn bearings, active sonar pings - everything you do radiates

LIVING BOAT, LIVING CAMPAIGN

12 autonomous crewmen who stand watch, eat, sleep, fight fires and flooding, and die - manning matters

Scripted campaign plus endless procedural tasking: intercepts, strikes, convoy escorts, reconnaissance, joint operations

Multiple scenarios from a forgiving first patrol to a shallow, mined channel transit with no deep escape

Day/night cycle, dynamic weather and sea state, ocean currents, coastal bathymetry

Career log tracks your patrols, kills, deaths, and meltdowns across games

SURVIVE
Breakdowns strike without warning: pump trips, leaks, fires, radiation. Wear grinds down machinery unless your crew maintains it. Auto-pause catches disasters at high time compression - or turn it off and live dangerously.
The sea doesn't care about your mission. Bring your crew home.